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vendor/k8s.io/kubernetes/cluster/juju/layers/kubernetes-master/README.md
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# Kubernetes-master
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[Kubernetes](http://kubernetes.io/) is an open source system for managing
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application containers across a cluster of hosts. The Kubernetes project was
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started by Google in 2014, combining the experience of running production
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workloads combined with best practices from the community.
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The Kubernetes project defines some new terms that may be unfamiliar to users
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or operators. For more information please refer to the concept guide in the
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[getting started guide](https://kubernetes.io/docs/home/).
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This charm is an encapsulation of the Kubernetes master processes and the
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operations to run on any cloud for the entire lifecycle of the cluster.
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This charm is built from other charm layers using the Juju reactive framework.
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The other layers focus on specific subset of operations making this layer
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specific to operations of Kubernetes master processes.
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# Deployment
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This charm is not fully functional when deployed by itself. It requires other
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charms to model a complete Kubernetes cluster. A Kubernetes cluster needs a
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distributed key value store such as [Etcd](https://coreos.com/etcd/) and the
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kubernetes-worker charm which delivers the Kubernetes node services. A cluster
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requires a Software Defined Network (SDN) and Transport Layer Security (TLS) so
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the components in a cluster communicate securely.
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Please take a look at the [Canonical Distribution of Kubernetes](https://jujucharms.com/canonical-kubernetes/)
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or the [Kubernetes core](https://jujucharms.com/kubernetes-core/) bundles for
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examples of complete models of Kubernetes clusters.
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# Resources
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The kubernetes-master charm takes advantage of the [Juju Resources](https://jujucharms.com/docs/2.0/developer-resources)
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feature to deliver the Kubernetes software.
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In deployments on public clouds the Charm Store provides the resource to the
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charm automatically with no user intervention. Some environments with strict
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firewall rules may not be able to contact the Charm Store. In these network
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restricted environments the resource can be uploaded to the model by the Juju
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operator.
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# Configuration
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This charm supports some configuration options to set up a Kubernetes cluster
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that works in your environment:
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#### dns_domain
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The domain name to use for the Kubernetes cluster for DNS.
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#### enable-dashboard-addons
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Enables the installation of Kubernetes dashboard, Heapster, Grafana, and
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InfluxDB.
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#### enable-rbac
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Enable RBAC and Node authorisation.
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# DNS for the cluster
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The DNS add-on allows the pods to have a DNS names in addition to IP addresses.
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The Kubernetes cluster DNS server (based off the SkyDNS library) supports
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forward lookups (A records), service lookups (SRV records) and reverse IP
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address lookups (PTR records). More information about the DNS can be obtained
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from the [Kubernetes DNS admin guide](http://kubernetes.io/docs/admin/dns/).
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# Actions
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The kubernetes-master charm models a few one time operations called
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[Juju actions](https://jujucharms.com/docs/stable/actions) that can be run by
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Juju users.
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#### create-rbd-pv
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This action creates RADOS Block Device (RBD) in Ceph and defines a Persistent
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Volume in Kubernetes so the containers can use durable storage. This action
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requires a relation to the ceph-mon charm before it can create the volume.
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#### restart
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This action restarts the master processes `kube-apiserver`,
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`kube-controller-manager`, and `kube-scheduler` when the user needs a restart.
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# More information
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- [Kubernetes github project](https://github.com/kubernetes/kubernetes)
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- [Kubernetes issue tracker](https://github.com/kubernetes/kubernetes/issues)
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- [Kubernetes documentation](http://kubernetes.io/docs/)
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- [Kubernetes releases](https://github.com/kubernetes/kubernetes/releases)
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# Contact
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The kubernetes-master charm is free and open source operations created
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by the containers team at Canonical.
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Canonical also offers enterprise support and customization services. Please
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refer to the [Kubernetes product page](https://www.ubuntu.com/cloud/kubernetes)
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for more details.
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